Enzyme Stabilization Using Polyhydroxy Compounds
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Solution Overview
Problem
There is a need for a stabilizing compound effective for all enzymes, particularly in aqueous solutions used in industrial applications like pulp and paper production, where sterol esterases require specific conditions to maintain stability.
Innovation Solution
The use of organic polyhydroxy compounds with three or more hydroxyl groups per molecule, such as sorbitol and glycerol, as stabilizers in enzyme compositions, which can achieve stability without surfactants, by maintaining the enzyme in solution for extended periods at varying temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional stabilizers (surfactants, cyclodextrins, or simple alcohols like propylene glycol) are used, then some enzymes show improved stability, but no single stabilizer is universally effective for all enzyme types and the enzyme may still precipitate or lose activity
Solution Approach 1:
The patent changes the chemical parameters of the stabilizer by specifying organic polyhydroxy compounds with three or more hydroxyl groups per molecule (such as sorbitol, mannitol, xylitol, glycerol). This specific parameter change (number of hydroxyl groups ≥3) provides universal stability across different enzyme types including sterol esterases, lipases, and proteases, resolving the contradiction between reliability and adaptability
Solution Approach 2:
The patent establishes a universal stabilizer class (organic polyhydroxy compounds with ≥3 hydroxyl groups) that functions across multiple enzyme types and applications. The compositional parameters (≥20% w/w stabilizer, specific hydroxyl group count) create a multi-functional solution that stabilizes diverse enzymes without requiring enzyme-specific optimization, achieving both reliability and versatility
2Reliability
If surfactants are added to stabilize enzymes in aqueous solution, then enzyme stability improves, but the composition complexity increases and may introduce unwanted side effects
Solution Approach 1:
The patent extracts and eliminates surfactants from the enzyme composition while maintaining stability through organic polyhydroxy compounds. By removing the surfactant component entirely and replacing it with a simpler stabilizer class (polyhydroxy compounds), the composition complexity is reduced while preserving or improving enzyme stability
Solution Approach 2:
The patent changes the compositional parameters by specifying organic polyhydroxy compounds with three or more hydroxyl groups per molecule at concentrations of ≥20% w/w. This parameter change replaces complex surfactant molecules with simpler polyhydroxy compounds, reducing composition complexity while achieving the desired stability
3Productivity
If enzyme concentration is increased to improve productivity, then more substrate can be processed, but enzyme precipitation and instability increase
Solution Approach 1:
The patent applies preliminary stabilization by incorporating ≥20% w/w organic polyhydroxy compound into the enzyme composition before use. This preliminary action prevents precipitation and maintains solubility, enabling higher enzyme concentrations to be used productively without losing stability
Solution Approach 2:
The patent changes the compositional parameters by specifying organic polyhydroxy compounds with ≥3 hydroxyl groups at ≥20% w/w concentration. This parameter change creates a stable environment that allows increased enzyme concentration for higher productivity while preventing the precipitation that would normally occur at elevated enzyme levels
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The described solution ensures that enzymes with a WGESAG sequence motif and a catalytic triad of S, H, and E/D remain stable for at least 4 weeks at 37°C, maintaining their activity and preventing precipitation, even in the absence of surfactants.
Implementation Method 1
The stabilizing effect can be achieved even without the addition of a surfactant, if the organic polyhydroxy compound is present in an adequate concentration and has sufficient hydroxyl groups per molecule
Data Source
AI summary
A solution stable enzyme composition comprising an enzyme component, a stabilizer component, an optional antimicrobial preservative and water is disclosed, as well as its use in manufacturing of pulp and paper.